CVE-2026-45348Public exploitNetwork attack vector

Stored XSS via unescaped package link URLs

Published May 28, 2026 · Updated May 28, 2026

Stored XSS in pyLoad before 0.5.0b3.dev100 allows remote authenticated users to execute JavaScript in operators' browsers via package links. The packages.js template inserts stored link URLs into single-quoted HTML without escaping and passes the resulting string to jQuery.html(). Perms.ADD access is sufficient; when ClickNLoad is enabled, remote attackers can reach the same sink, and an operator's visit can expose same-origin session cookies.

CVSS severity8.7
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in pyLoad before 0.5.0b3.dev100 allows remote authenticated users to execute JavaScript in operators' browsers via package links. The packages.js template inserts stored link URLs into single-quoted HTML without escaping and passes the resulting string to jQuery.html(). Perms.ADD access is sufficient; when ClickNLoad is enabled, remote attackers can reach the same sink, and an operator's visit can expose same-origin session cookies.

The record

CVE
CVE-2026-45348
Published
May 28, 2026
Updated
May 28, 2026
Vendor
pyLoad
Product
pyLoad
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.5.0b3.dev100

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

pyLoad · pyLoadversion=< 0.5.0b3.dev100

Published CVSS scores

8.7GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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